JP2821566B2 - Pipe inner lining repair method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas pipe in which a supply pipe for drawing gas or the like from a pipe line laid under a road, such as a gas pipe, to a demand destination is branched. In order to regenerate the inside of the pipe, a first step of introducing the liquid resin from the end opening of the supply pipe and transferring the whole of the liquid resin from the rear to the branch position on the conduit side by a liquid flow through a pig was introduced. When the resin is drawn back to the end of the supply pipe by suction of the liquid flow and the second step of applying and lining the inner surface of the supply pipe is performed, the completion of the second step can be confirmed, and the resin can be distributed through the pipeline. The present invention relates to a repair method capable of preventing gas from being released to the outside and recovering pigs.

[0002]

2. Description of the Related Art Supply pipes as described above are to be repaired.
A repair method for introducing a liquid resin into the supply pipe and lining the inside of the supply pipe has been well known. As a repair method, the present applicant previously proposed a non-digging type repair method capable of digging a branch portion of a conduit laid under a road and lining the inner wall of a supply pipe without making a cut opening. See JP-A-4-114773.

In this prior art, an opening as a resin injection port is provided at a terminal side of a supply pipe for a supply pipe branched from a conduit below a road, and it is necessary to introduce the resin into the pipe from this opening. In the first step, the whole amount of the resin is transferred to the branch position on the side of the conduit by moving the entire amount of the resin in a plug shape, and in the second step, the resin is drawn back to the end side of the supply pipe by suction from the opening while being drawn into the pipe. Repair is basically applied to the surface and lining is applied.

When the above-mentioned repair method is applied, a method of transferring the resin by using an incompressible hydraulic pressure flow is applied as a means for transferring the resin. This repair method will be described with reference to FIGS. 1 and 2. The supply pipe 2 branched from the conduit 1 laid under the road and drawn into the residential land is to be repaired.
FIG. 1 shows a first step of the repair, and FIG. 2 shows a subsequent second step.

In a first step shown in FIG. 1, a lining pig 3 is arranged at the head of a meter standing pipe 2a provided at the end of a supply pipe 2 through a terminal opening thereof, and a repairing pipe is provided at a subsequent stage. The resin A is introduced in the form of a plug in a liquid state. This resin A is introduced into the end opening of the meter stand 2a by, for example, 1
As an example, the resin A stored in the tank by connecting the manual type resin injection tank 4 and pressing down the piston 4a
Here, as the amount of the resin A, the required amount calculated from the relevant conditions such as the length of the supply pipe 2 to be repaired, the inner diameter of the pipe, and the thickness of the coating film to be formed is introduced.

After the introduction of the resin A, another pig cassette 5 is replaced and connected to the end opening of the meter stand 2a. In the pig cassette 5, a resin transport pig 51 which is pushed and moved so as not to leave the whole amount of the introduced resin A in the pipe.
And a water-absorbing material 52 having a required water-absorbing capacity and a water-blocking pig 53 are housed. The other end of the pig cassette 5 is connected to a tip of a water supply hose 6 extending from a water pump 7. Then, water absorbed from the water tank 9 by the operation of the water supply pump 7 is fed into the pig cassette 5 through the water supply hose 6, and the resin transport pig 51, the water absorbing material 52, and the like stored in the pig cassette 5 by the water pressure flow. Water pressure acts on the water-blocking pig 53 from the rear, and due to a pressure difference generated in the pipes before and after the resin plug A due to the water pressure, the resin plug A moves through the pipe of the supply pipe 2 with the lining pig 3 at the head. Move toward side 1 and lead lining pig 3
When water reaches the branch position on the conduit 1 side, the water supply is stopped to stop the movement of the resin plug A.

During the movement of the resin plug A, between the water pressure flow from the rear and the resin plug A, a water-blocking pig 53 and a water absorbing material 5 are provided.
2. Even if the resin transport pig 51 is interposed and water leaks from the peripheral gap of the water-blocking pig 53 and flows forward due to the pressure of the hydraulic flow, the water is absorbed by the water-absorbing material 52, Since the function becomes two-stage, mixing of water into the resin plug A is completely avoided.

Following the above-described first step, the second step shown in FIG.
In the process, a collection tank 11 is connected to a terminal opening of the meter standing pipe 2a via a connecting pipe 10 (suction passage),
A vacuum pump 13 is connected to this via a hose 12. By the operation of the vacuum pump 13, the water that has been sent in the previous first step due to the water absorbing action and stays in the supply pipe 2 and the meter standing pipe 2 a is successively absorbed by the tank 11.
The resin plug A that has been collected inside and sent to the branch end on the side of the conduit 1 along with it moves so as to be pulled back in the direction opposite to the first step. In this moving process, the lining pig 3 follows the tail of the resin plug A, and a coating film of a required film thickness is formed on the inner wall of the supply pipe 2 by the lining pig 3 in the retraction stroke. The lining is applied to the entire area of the supply pipe 2 including the meter standing pipe 2a.

In the second step, prior to the movement of the resin plug A to be pulled back, the impermeable pig 51 wipes off the water on the inner wall of the pipe, and then the water adsorbing material 52 further removes the water adhering to the inner wall of the pipe. By absorbing and removing water, the subsequent resin plug A
Water bubbles are not generated in the coating film formed by the above, and proper lining construction is achieved.

[0010]

As described above, according to this repair method, a good lining is provided in the supply pipe 2, but the completion of the second step follows the trailing end. It is completed when the lining pig 3 has passed through the terminal opening of the meter stand 2a. As a method of confirming the completion, a connecting tube 1 connected to the terminal opening of the meter stand 2a is used.
0 (a suction passage), a pressure gauge is provided in the middle, and the water-impervious pig 53, the water-absorbing material 52, and the resin transport pig 51 to be recovered are in a negative pressure state before passing through the position of the pressure gauge, and in a positive pressure state after passing. The change can be confirmed by visually observing a change in the pressure state (the gas pressure flowing from the conduit 1 side). However, in this case, when the pig passes, the excess resin in the passage flows into the vent of the pressure gauge and closes the hole, or adheres to the Bourdon tube or the diaphragm, which is the sensor part of the pressure gauge, to disable the operation. There is a problem.

Another problem is that it is difficult to collect the impermeable pig 53, the resin transport pig 51, the lining pig 3 and the like without hindering the lining work. When the gas flow in the supply pipe 2 blows to the recovery tank 11 side due to the action, the pulsation due to the blow-through may cause disturbance in the lining coating film formed in the supply pipe 2, or the pipe 1 may be disturbed. The problem that the circulating gas on the side is discharged outside through the suction passage also arises.

An object of the present invention is to provide a pig collecting apparatus which can solve the above-mentioned problems.

[0013]

In order to achieve this object, the present invention relates to a pipe inner surface lining repair method comprising the first step and the second step described above. A pressure gauge that detects the passage of the pig by a negative pressure before the pig passes and a gas pressure after the pig passes through a suction passage between a terminal opening of the pig and a water recovery tank communicated with the vacuum pump. (2) At the time of the second step, the suction passage between the terminal opening of the supply pipe and the water recovery tank connected to the vacuum pump, A pig stop for receiving the pig is provided to collect the pig.

[0014]

According to the present invention, upon completion of construction in the second step,
When a liquid-shielding pig, a liquid-absorbing material, and a resin-carrying pig that are collected and moved prior to the resin pass through the pressure gauge position, a negative pressure state before passing and a positive pressure state after passing (flow from the conduit 1 side). Change) can be visually confirmed with a pressure gauge, so that the completion of the construction in the second step can be confirmed.

In the suction passage, a pig stop is provided at the preceding stage of the recovery tank.
Pigs are collected without causing any disturbance to the lining coating formed in the tube.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a schematic diagram showing a second step of the pipe inner surface lining repair method to which the pig recovery apparatus of the present invention is applied. In the second step, the resin A is supplied to the metering pipe 2a by the negative pressure generated from the vacuum pump 13 with the lining pig 3 in the rear of the supply pipe 2 and the resin transporting pig 51, the water absorbing material 52, and the water shielding pig 53 in the front. , While forming a lining coating film behind the lining pig 3. A detection unit 20 having a pressure gauge 21 is connected to an end opening of the meter standing pipe 2a, and a water absorption hose 26, a pig stopper 30, a collection tank 4
0, the vacuum pump 13 is connected in series via a hose 49. The pig stopper 30 has a stopper plate 38 having a concave hole formed therein for receiving the pig therein, and includes a lining pig 3, a resin transport pig 51, a water shielding pig 53, and a water absorbing material 52.
Are collected, and each pig is stopped by a stopper plate 3 as described later.
In the state fitted in the concave hole of No. 8, the hole is closed to shut off gas flow, and water sucked prior to the pig is collected in the resin receiver 47 in the recovery tank 40.

FIG. 4 is a detailed view of the detection unit 20. The detection unit 20 includes a pipe 22 having a connection nipple 22a connected to the meter standing pipe 2a and a hose nipple 22b connected to a water absorption hose 26 at both ends. A connecting nipple 24b fixed in the middle of the pipe 22 via a fine hole 25, and a sponge sphere 23 of a continuous cell which is pushed into the connecting nipple 24b without a gap and allows water to pass through but does not allow resin to pass through.
And a connection fitting 24a which is detachable from the connection nipple 24b and a pressure gauge 2 connected to the connection fitting 24a.
Consists of 1.

The change in pressure to be detected is transmitted from the pore 25 to the pressure gauge 21 via the sponge sphere 23 and measured.
At this time, since the pipe 22 provided with the pressure gauge 21 rapidly changes from a negative pressure state before passing the pig to a positive pressure state after passing the pig, surplus resin may flow from the fine holes 25 when passing the pig. Even if the pressure gauge 21 is blocked by the sponge ball 23 and does not enter any more, it does not block the ventilation hole of the pressure gauge 21 or adhere to the Bourdon tube or the diaphragm which is the sensor part of the pressure gauge 21 to make it inoperable.

FIG. 5 is a cross-sectional view of the pig stopper 30. The pig stopper 30 is divided into an upper lid 32 and a lower chamber 33 so that the pigs 3, 51, and 53 housed therein can be easily collected. Top lid 3
Hose nipple 3 connected to water absorption hose 26
The lower chamber 33 communicates with the top plate 42 of the collection tank 40 below the lower chamber 33, and a stop plate 38 is provided inside. The stopper plate 38 is provided with three concave holes 39 that are ventilated during the second step and are closed when the pig is collected. Since the concave hole 39 is a tapered hole opened upward as shown in the figure, it can correspond to pigs of various sizes. With this configuration, the pig stopper 30 easily stores the lining pig 3, the resin transport pig 51, and the water-blocking pig 53, and simultaneously shuts off the suction of the vacuum pump 13 simultaneously with the storage of each pig. Gas pump 1
3 prevents the gas from being released to the outside. Note that, in the above-described embodiment, the case where non-compressible water is used as the liquid to transfer the resin plug introduced into the supply pipe and to perform the suction movement has been described.
The present invention can be similarly implemented by using another incompressible liquid instead of the water.

[0020]

According to the present invention, when the construction in the second step is completed, when the liquid-shielding pig, the liquid-absorbing material, and the resin-carrying pig that are collected and moved prior to the resin pass through the position of the pressure gauge, Since the change between the negative pressure state before passing and the positive pressure state after passing (gas pressure flowing from the conduit 1 side) can be visually confirmed by the pressure gauge, the completion of the construction in the second step can be confirmed.

In addition, since the suction passage is provided with a pig stop in front of the recovery tank, immediately after completion of the lining work, the lining coating film formed in the supply pipe 2 is not disturbed without causing any disturbance. Pigs can be collected.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a first step of a conventional lining repair method.

FIG. 2 is an explanatory view showing a second step of the conventional lining repair method.

FIG. 3 is an explanatory view showing a second step of the lining repair method using the pig recovery apparatus of the present invention.

FIG. 4 is a schematic diagram of a pig collection device of the present invention.

FIG. 5 is a schematic view of a pig stopper of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conduit 2 Supply pipe 2a Meter stand 3 Lining pig 8 Water supply pump 5 Pig cassette 51 Resin carrying pig 52 Water absorbing material 53 Water blocking pig 20 Detection unit 21 Pressure gauge 22 Pipe 23 Sponge ball 30 Pig stop 38 Stop plate 39 Concave hole 40 Collection tank

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-58274 (JP, A) JP-A-1-127076 (JP, A) UK Patent Application Publication 2114255 (GB, A) UK Patent Application Publication 2094178 ( GB, A) French Patent Publication 2536498 (FR, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B05C 7/06-7/08 B05D 7/22 F16L 55/16 F16L 57/00 F16L 58/10 EPAT (QUESTEL)

Claims (2)

(57) [Claims] In a first step, a required amount of resin necessary for lining the inside of a supply pipe is introduced into the supply pipe in a plug form from an end opening of the supply pipe with the supply pipe branched from the conduit path as a repair target. Then, the entire amount of the resin is transferred to the branch position on the conduit side by hydraulic flow from the rear thereof through a pig, and in the second step, the pig and the resin are pulled back to the end side of the supply pipe by suction of the hydraulic flow by a vacuum pump. In the lining repair method for the inner surface of the pipe, which is applied to the inner surface of the pipe in the process of lining, in the second step, the suction passage between the end opening of the supply pipe and the water recovery tank connected to the vacuum pump is provided. A pressure gauge for detecting the passage of the pig based on the negative pressure before the pig passes and the gas pressure after the pig passes, and confirms the completion of the lining construction. Training repair method. 2. The method according to claim 2, wherein in the second step, a pig stop is provided in a suction passage between an end opening of the supply pipe and a water recovery tank connected to the vacuum pump to receive the pig, and the pig is recovered. The method for repairing a pipe inner surface lining according to claim 1, characterized in that: